When I'm on the road I usually take with me everything that's in my Laptop/Home Office bag, but with a few extras that I don't keep in my bag all the time.
The main compartment holds my Acer C720 Chromebook in an iPearl hard shell full body cover, my Asus Google Nexus 7 (2012), External USB 3.0 HDD and the power cord for my Acer C720 Chromebook.
The great thing about this setup is that I'm always ready for going on the road, as all I've got to do is attach the shoulder strap for my Targus Slimline Netbook Case and I can leave the house with my bag.
I also keep with me at all times an old possibly 2nd gen iPod Touch, a Fitbit Flex charging dock, a spare iPhone USB Charging brick, a Huawei E5330 Mobile Hotspot along with its USB charging cable, Huawei E5330 Mobile Hotspot Charging Brick, a pair of Apple Earpods & a pair of Beats by Dr. Dre urbeats.
|Huawei E5330 Mobile Hotspot|
2nd Gen iPod touch
|Fitbit Flex Charging Dock|
|iPhone Charging Brick|
|Beats by Dr. Dre urbeats|
The extras that I keep with me on the Road are an iPhone 4/4S Battery Case and my iPhone 4S Dock cable and USB Charging Brick, and since I've just recently got a Powermat iPhone 4/4S Wireless Charging kit I'll probably take that with me on longer trips as well.
|iPhone 4/4S Battery Case|
iPhone 4S Charger
|Powermat Wireless Charging Dock|